Function canConstructAtWithClear

src/OpenLoco/src/Map/TileClearance.cpp:383–424

0x00462937

    // 0x00462937
    static bool canConstructAtWithClear(const World::Pos2& pos, uint8_t baseZ, uint8_t clearZ, const QuarterTile& qt, BuildingCollisionType flags, std::function<ClearFuncResult(TileElement& el)> clearFunc)
    {
        _constructAtElementPositionFlags = ElementPositionFlags::aboveGround;
        if (!drawableCoords(pos))
        {
            GameCommands::setErrorText(StringIds::off_edge_of_map);
            return false;
        }

        bool collisionRemoved = false;
        do
        {
            collisionRemoved = false;
            const auto tile = TileManager::get(pos);
            for (auto& el : tile)
            {
                const auto* elSurface = el.as<SurfaceElement>();
                const auto res = elSurface == nullptr ? canConstructAtCheckNonSurfaceElement(baseZ, clearZ, qt, flags, clearFunc, el)
                                                      : canConstructAtCheckSurfaceElement(baseZ, clearZ, qt, clearFunc, el, *elSurface);
                switch (res)
                {
                    case ClearFuncResult::noCollision:
                        break;
                    case ClearFuncResult::allCollisionsRemoved:
                        return true;
                    case ClearFuncResult::collision:
                        setCollisionErrorMessage(el);
                        return false;
                    case ClearFuncResult::collisionRemoved:
                        collisionRemoved = true;
                        break;
                    case ClearFuncResult::collisionErrorSet:
                        return false;
                }
                if (collisionRemoved)
                {
                    break;
                }
            }
        } while (collisionRemoved);
        return true;
    }

    // 0x00462908
    bool applyClearAtAllHeights(const World::Pos2& pos, uint8_t baseZ, uint8_t clearZ, const QuarterTile& qt, std::function<ClearFuncResult(TileElement& el)> clearFunc)